Parameter Matching Of Power System And Research On Handling Stability Of Heavy Multi-axle Vehicle With In-wheel Motors

In order to solve the global problems such as the lack of energy and theenvironment pollution while society and science is developing, more and morecountries become to focus on the electric vehicle which is the symbol of the newenergy automobile. Electric vehicle with in-wheel motor, especially for specialelectric vehicle with in-wheel motor, has its unique and obvious advantages such aslower noise, faster response to speeding up at low speed condition, more convenientto the vehicle dynamic control, better flexibility, lighter weight and so on comparedwith traditional car. In contrast to other electric vehicles, electric vehicle within-wheel motor is more convenient for automobile general layout and simpler forvehicle dynamic control with the characteristic of independent torque assortment.In foreign army especially American army, the electric and modern transformingof military vehicles has been already finished. But in China, the research of electricmulti-axle heavy vehicles or electric special vehicles is nearly not referred. The mainpurpose of this dissertation is to match the parameters of power system and give aresearch on handling stability control strategy of heavy multi-axle vehicles within-wheel motors for motor-in-wheel driving process of heavy vehicles and specialvehicles.At first, according to the basic parameters of similar vehicles, on the basis ofdynamic property such as the highest speed, the maximum gradient and theacceleration time as well as economy property such as the mileage, the power systemthat the vehicle needed to be developed is designed. It is mainly included of thedesign and choice of proper in-wheel motors and batteries, and then the power systemconforms to the dynamic and economy needed property, the parameter matching is finished. Furthermore, on the basis of the power train system parameters, according tothe mathematics model of vehicle dynamics and kinematics, the27-degree computersimulating model is built by the platform of the software MATLAB/Simulink. Afterthe further research on the method of handling stability control, the direct yaw controlbased on the yaw rate and the center slip angle to be the control method, and fuzzyself-adjusting PID controller using the fuzzy rules for the PID parameters real-timeadjustment is designed. Moreover, the control strategy is investigated with theimprovement of the heavy multi-axle vehicle handling stability and the steeringstability by the simulation. In order to change the phenomenon that longer steeringradius when using the control strategy at the low speed condition, the method ofimproving the traffic ability that increasing the outer wheel torque is referred. What’smore, the transient response and the steady-state characteristics of heavy multi-axlevehicle handling stability are investigated by the comparison at3driving conditions.At last, the influence on the heavy multi-axle vehicle handling stability when motorfailure happens is investigated. A method to control motor failure is referred and theimprovement of the handling stability with the method by simulation is verified.The breakthrough of special use vehicle and heavy vehicle is the guarantee ofnational defense and people’s life and property safety. The research and use of themotor-in-wheel drive technology in the field of special vehicle has great meaning forboth national defense and electric informational industry. At the same time, thedissertation is possible to providing reference both for motor-in-wheel drivetechnology towards to the use of heavy and special vehicle in the future and theinvestigation and development of heavy multi-axle and special use vehicle.